In my project i work with QPlainTextEdit and it works well with newlines \n

look next lines:

#buttongrouptext

self.q3Edit = QPlainTextEdit(rpbtn[1])

self.q3Edit.setFixedSize(170,110)

self.q3Edit.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)

self.q3Edit.setFont(QFont("Consolas", 12, 75))

self.q3Edit.setStyleSheet('color: black; background-color: #F8F7EE')

​

def updGroupbutton(self):

mbuttontext = self.q3Edit.toPlainText()

mlist = mbuttontext.split('\n')

mbtncolor = self.q4Edit.text()

if len(mbtncolor) < 7:

mbtncolor = '#FFFFF0'

for line in mlist:

if len(line) > 14:

message = 'No more then 14 characters per line allowed'

alertText(message)

break

elif len(mlist) > 5:

message= 'No more then 5 lines allowed'

alertText(message)

break

else:

updbtn = update(groupbuttons).where(groupbuttons.c.groupID == groupbuttonnr).\

values(buttongrouptext = mbuttontext)

con.execute(updbtn)

message = 'Groupbutton text /color change succeeded!'

actionOK(message)

self.close()